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Abstract
In order to further enhance the application field of zein-based microcapsule. Zein-based amorphous TiO2 composite microcapsules (ZTCMs) were innovatively prepared from zein, tetra butyl ortho titanate (TBOT) and PEO106PPO70PEO106 (F127) via interface template synthesis. The Effects of TBOT amount on ZTCMs structures and photo-catalytic performances were mainly investigated. Chemical structure and microstructure of the obtained composite microcapsules were characterized mainly by fourier-transform infrared spectroscopy (FTIR), transmission electron microscope (TEM), scanning electron microscope (SEM) and energy disperse spectroscopy (EDS). The results show ZTCMs exhibited evident hollow structure with titanium dioxide (TiO2) wrapped in the outer layer. The average size of ZTCMs300 was approximately 4 µm, which increased as the increase of TBOT dosage. Significantly, ZTCMs showed excellent photo-catalytic ability on dyes, red wine and coffee alike. The degradation rate of Rhodamine B (RB) was more than 80% after irradiation for 5 h under sunlight. This study provides a facile method to fabricate natural-based photo-catalytic material, which will be a good candidate in many fields such as medicine, food packaging, leather and textile.
Highlights
In the past few decades, massive use of fossil resources has led to the rapid consumption of global oil reserves and soaring oil prices
In this study, amorphous TiO2-coated zein microcapsules (ZTCMs) were prepared by interface template synthesis to improve the utilization of zein and the specific surface area of amorphous TiO2, and the possible synthesis strategy of Zein-based amorphous TiO2 composite microcapsules (ZTCMs) was proposed as exhibited in Scheme 1
The results show the size of the microcapsules increased with the addition of TiO2, which is consistent with the characterization results of scanning electron microscope (SEM) and transmission electron microscope (TEM)
Summary
In the past few decades, massive use of fossil resources has led to the rapid consumption of global oil reserves and soaring oil prices. The synthesis of functional materials based on TiO2 and zein by combining the photo-catalytic performance of TiO2 and the film-forming property of zein has been reported. Li et al demonstrated a novel method to prepare composite films by using zein, poly propylene carbonate and anatase TiO2, which indicated TiO2 can endow composite films with photo-catalytic activity [25]. Qu and co-workers reported an effective method to improve the photo-catalytic performance of composite films by adding highly dispersible TiO2 nanoparticles [26]. In this study, amorphous TiO2-coated zein microcapsules (ZTCMs) were prepared by interface template synthesis to improve the utilization of zein and the specific surface area of amorphous TiO2, and the possible synthesis strategy of ZTCMs was proposed as exhibited in Scheme 1. ZTCMs were obtained after spray drying the microcapsules emulsion
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